Just wondering Phil, is your interferometer able to estimate Strehl ratios or RMS?
Strell ratio and RMS are simply calculated values from data you read from whatever test-rig you employ - so yes, you could use it for that. Now... admission time... although I have the bits for the interferometer, I haven't put it together yet as I banjaxed my arm last year and couldn't so much as lift a pencil... and that project hasn't floated back to the top of my to-do list! I'll be away for a couple of weeks at the beginning of September but will get down to business with it when I get back.
  